Cattedown is an inner city suburb of Plymouth

Plymouth

Plymouth is a city and unitary authority area on the coast of Devon, England, about south-west of London. It is built between the mouths of the rivers Plym to the east and Tamar to the west, where they join Plymouth Sound...

, Devon. Its position beside the River Plym

River Plym

The River Plym is a river in Devon, England. Its source is some 450m above sea level on Dartmoor, in an upland marshy area called Plym Head. From the upper reaches which contain antiquities and mining remains the river flows roughly southwest and enters the sea near to the city of Plymouth, where...

estuary just short of the mouth led to its early settlement.

It is said that its name came from a rocky outcrop in this area that overlooked the Plym estuary and mouth of the river, looked like a cat; lending its name to the area and the area of water around it: the 'Cattewater'.